A powder or flour like thing sprinkled on the leaves or stem of your indoor plants is White Powdery Mold. It is a fungal disease that impacts an extensive variety of plants and contaminate plants under highly humid conditions as other fungal infestations. Many kinds of plants including ornamental, flowering, fruit and vegetables are susceptible to this fungal infestation. It is spore bearing (usually pigmented spores) and found all through the United States. White Powdery Mold is also called as Powder mildew, is very easy to detect, a white/grey powdery layer or spots frequently on lower leaves shows up on contaminated plants. These spots can be on any part of the infected plant as stem, branch or even fruit. Be aware of this toxic powdery mold as it is considered harmful for humans. Mostly it infects at the end of growing season. It is necessary to monitor your plants regularly to control spread of infestation

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